The A¹Π(v = 1) level of the ¹²C¹⁸O isotopologue was precisely reinvestigated with two complementary spectroscopic techniques. High resolution B¹Σ⁺ → A¹Π(0, 1), (1, 1) and C¹Σ⁺ → A¹Π(0, 1) emission bands were recorded in the visible region, 20,700 – 26,100 cm⁻¹, with a 1.71 m Fourier-transform spectrometer (Bruker IFS 125-HR) installed at the University of Rzeszów. The resulting line centre accuracy of isolated and medium to strong lines is 0.005 cm⁻¹. In addition, high-resolution spectra of the A¹Π ⟵ X¹Σ⁺(1, 0), B¹Σ⁺⟵ X¹Σ⁺(0, 0) and (1, 0) as well as C¹Σ⁺⟵ X¹Σ⁺(0, 0) bands were recorded between 66,200 and 95,250 cm⁻¹ using the vacuum-ultraviolet Fourier-transform spectrometer installed at the DESIRS beamline of the SOLEIL synchrotron. The wavenumber accuracy for isolated and strong spectral lines is 0.01 cm⁻¹. A data set of 626 spectral lines belonging to seven bands was incorporated into a global deperturbation analysis. Significantly improved deperturbed molecular constants for the A¹Π(v = 1), a´³Σ⁺(v = 10), D¹Δ(v = 1), and I¹Σ⁻(v = 2) levels, term values of the B¹Σ⁺(v = 0, 1) and C¹Σ⁺(v = 0) Rydberg states as well as the accompanying spin-orbit and rotation-electronic (L-uncoupling) interaction parameters were obtained. The experimental ro-vibrational term values of the A¹Π(v = 1) level and its perturbers were also determined. The mixed composition of interacting states is expressed in terms of their ¹Π percentage character.

该A ¹ Π（v 所述的= 1）级¹² Ç ¹⁸ ö同位素被精确地与两个互补光谱技术重新调查。高分辨率乙¹ Σ ⁺  →A ¹ Π（0，1），（1，1）和C ¹ Σ ⁺  →A ¹ Π（0，1）的发射带被记录在可见区域，20700 - 26100厘米^-1，并在热舒夫大学安装了1.71 m傅立叶变换光谱仪（布鲁克IFS 125-HR）。隔离线和中线到强线的所得线心精度为0.005 cm ^-1。另外，A的高分辨率光谱¹ Π⟵X¹ Σ ⁺（1，0），B ¹ Σ ⁺ ⟵X ¹ Σ ⁺（0,0）和（1,0），以及为C ¹ Σ ⁺ ⟵X ¹ Σ ⁺（0,0）频带，记录之间使用安装在SOLEIL同步加速器的DESIRS光束线上的真空-紫外傅立叶变换光谱仪，可以得到66,200和95,250 cm ^-1的光。隔离的强光谱线的波数精度为0.01 cm ^-1。属于七个波段的626条光谱线的数据集被合并到全局去扰动分析中。为A显著改进deperturbed分子常数¹ Π（v = 1）α，α'- ³ Σ ⁺（v  = 10），d ¹ Δ（v  = 1）和I ¹ Σ ^- （v  = 2）的水平，所述B的条款值¹ Σ ⁺（v  = 0,1，... ）和C ¹ Σ ⁺（v  = 0）德堡态以及伴随的自旋轨道和旋转电子（大号-获得解偶联）的相互作用参数。在A的实验振转术语值¹ Π（v = 1）水平及其扰动也已确定。交互状态的混合组成其来表示^1个Π个字符。